My Lenovo T410. It has an i5 2.4 GHz CPU, 4 GB RAM, and a 230 GB HD. Everything works out of the box with OpenBSD 6.0/amd. I installed OpenBSD with cat5 and DHCP. The wireless firmware installed after the first reboot.

Dell Latitude E6400
I've been using it as guinea pig. Differences from "stock" model:
- Bluetooth mPCIe replaced by Lenovo F5521GW UMTS modem (curiosity, It does not seem to function as a modem in this slot though),
- added UMTS modem Dell DW5570 (originally meant for different model)
- original HDD replaced by old Intel 160GB SATA SSD.

What works: Wifi (after I downloaded necessary firmware)Suspend/Resume (my 1y old toddler opened-closed laptop's lid like a hundred times in a row, going into resume and coming out of it continued working perfectly)Graphics - works out of the box.Built-in SD card reader

Haven't tested yet -
Built-in smartcard reader:
DW5570 (I believe it would work, I lack the SIM card for testing but ifconfig is showing the following

Here's my OpenBSD Thinkpad W520 with Intel Quad Core i7-2760QM @ 2.40GHz, 8GB RAM, and NVIDIA Quadro 1000M with 96 CUDA cores and Optimus Technology. Where I had to work to get Optimus lined out on FreeBSD, OpenBSD handled it with no problem:

6.4 works out-of-the-box on my Lenovo T400 with Libreboot version 20160902. OpenBSD on this laptop has been my daily driver since late 2018.

The only caveat is that Libreboot cannot chainload OpenBSD's boot loader, so I cannot boot the recommended way. Instead, Libreboot's built-in grub2 needs to load the bsd kernel directly. This is the relevant entry from my grub.cfg:

I had to set outputs.spkr_source=dac-0:1 in /etc/mixerctl.conf to force the speaker output (the laptop defaults to the headphone output but switch to speakers when they are plugged in, this also happens under Linux but is more difficult to correct there).

The keyboard backlight controls don't work but display.brightness does, so that's fine.

__________________Linux is for people who hate Windows. BSD is for people who love UNIX.